DE202006003923U1 - Circuit arrangement for receipt of broadcast signals, has first tuner which is used for reception of analog signals as well as several channel-coded digital signals in at least two different procedures - Google Patents

Abstract

The circuit arrangement has first tuner (4) which is used for the reception of analog signals as well as several channel-coded digital signals in at least two different procedures. The tuner possesses one or more intermediate frequency outlets to which several channel decoders working in the different procedures and an intermediate frequency integrated circuit (11) are attached. The transport current outlets are attached to a common transport current data bus (16). A central processor is in a position to activate or deactivate the various channel decoders as well as the intermediate frequency integrated circuit individually. The circuit arrangement has a second tuner (5) which possesses one or more intermediate frequency outlets to which at least a channel decoder is attached. The transport current outlets are attached to the common transport current data bus with at least a channel decoder. The transportation current data bus is exactly a moving picture experts group (MPEG) decoder (18).

Description

The The invention relates to a circuit arrangement for receiving broadcast signals.

in the The state of the art is essentially three different transmission paths (Cable transmission, satellite transmission and terrestrial transmission) as well as the corresponding transmission standards for analog and digital broadcast signals. In the field of digital television these include under the generic term "DVB" (Digital Video Broadcast) combined digital television standard DVB-C (wired Digital television), DVB-S (satellite-based digital television) and DVB-T (terrestrial broadcast Digital TV). The spread of analogue television can also wired, satellite and terrestrial take place. Similarly, in the field of radio broadcasting analogue and digital signals transmitted by cable, terrestrial and satellite. For radio broadcasting become common also used the standards of digital and analogue television.

Corresponding These different norms are based on the desire of consumers a radio receiver, especially after a TV set with integrated radio receiver, which as possible many different transmission standards can receive.

So are in the prior art TV sets known that have at least one receiving tuner and by one or more extension modules expandable by at least one tuner are. With the appropriate equipment, these TVs are included able, DVB-T, DVB-C, terrestrial analogue TV, wired Analogue television and DVB-S to receive.

The The object of the present invention is a circuit arrangement to develop which reduces the technical effort that is necessary certain different broadcasting standards with a To be able to receive radio reception equipment.

These The object is achieved by a Circuit arrangement according to the independent claim solved.

It is used to receive several on different transmission paths and consequently, various methods of channel coded digital signals a so-called "first Tuner "used. In this case, the input of the first tuner is always at a time only connected to one of these different transmission paths. additionally receives this first tuner also the analog signals, which on the respective transferred transmission path become. The signals corresponding to the program selection are from the tuner in the form of a so-called "Zwischenfreguenzsignals" at least one so-called "intermediate frequency output" of the tuner provided. With this intermediate frequency signal will be at least two different Channel decoder and a so-called "intermediate frequency IC" supplied, wherein this intermediate frequency IC for the conversion of analog signals is responsible.

The at least two different channel decoders correspond to the specific ones Channel codings of the digital transmission paths, for their reception the first tuner is provided. The so-called "transport stream outputs" this at least two channel decoders are connected to a common so-called "transport stream data bus".

One central processor "activates" that channel decoder, which corresponds to the channel coding of the selected program. The intermediate frequency signal provided by the first tuner at the IF output, which contains the data of this program is thereby removed from decoded according to the activated channel decoder. The data of the selected Programs are used by the channel decoder as a transport stream to the common transport stream data bus supplied and then according to the state the technology weitervererbeitet.

Of the common transport stream data bus is to exactly one MPEG decoder connected, which the respective transmitted via the common transport stream data bus Transport stream further processed according to the prior art.

at The central processor activates the selection of an analogue program the said intermediate frequency IC. The intermediate frequency signal of the tuner is then analogous to the state of the art further processed.

About one so-called "second Tuners "can provide additional, transmitted on another transmission path receive digital signals and in the same way from one or the other several related Channel decoders are channel decoded according to their channel coding. The transport stream outputs this one or more channel decoders belonging to the second tuner are also on the said common transport stream data bus shot.

The selection of the channel decoder belonging to the second tuner also takes place via its activation by the central processor instead of.

there the processor makes sure that at any time not more than one to the common transport stream data bus connected channel decoder is active.

Out advantages of this invention over the prior art, which will be explained below become.

So can in this way DVB-T, DVB-C, DVB-S, analog terrestrial television, analog cable television, analog terrestrial radio and analogue wired audio broadcasting (FM / FM), digital terrestrial audio broadcasting (in accordance with the DVB-T standard) and digital wired audio broadcasting (according to the DVB-C standard) as well as digital satellite broadcasting (in accordance with the DVB-S standard) with a total of only two tuners are received, processed and played back by a corresponding TV set be, with the DVB signals over transmit a common transport stream data bus and decode from a single MPEG decoder become.

The costs for one or more other tuners and one or more others MPEG decoders are eliminated.

The costs for the hardware costs of optional expansion modules are eliminated.

A Board, which realizes the circuit according to the invention can have smaller geometric dimensions than a comparable, the prior art arrangement. This will be the Production of the board according to the invention possible with the same tools and machines as for the boards used by such TV sets who do not receive so many different broadcasting standards can, like the circuit arrangement according to the invention it provides. Thus, the production costs for TV sets, whose Receiving unit has a circuit arrangement according to the invention, across from the known in the art solutions considerably.

By the smaller dimensions also reduce the effort required around the circuit board in a TV housing concept integrate. In particular, lets see this make the terminal block relatively compact.

A advantageous development of the invention is that the Channel decoder and / or the intermediate frequency IC is / are capable of the so-called "AGC" (Automatic Gain Control) of the associated Tuners to control the input sensitivity of the tuner to the transmission characteristics to adapt to the connected signal path.

in the Following is a preferred embodiment of the invention explain using a drawing.

1 shows a circuit arrangement according to the invention:

1

kabelgebundener Übertragungsweg

2

terrestrischer Übertragungsweg

3

satellitengestützter Übertragungsweg

4

erster Tuner

5

zweiter Tuner

6

Zwischenfrequenzausgang des ersten Tuners

7

Zwischenfrequenzausgang des zweiten Tuners

8

DVB-T-Kanaldekoder

9

DVB-C-Kanaldekoder

10

DVB-S-Kanaldekoder

11

Zwischenfrequenz-IC

12

AGC-Steuerleitung vom DVB-T-Kanaldekoder zum ersten Tuner

13

AGC-Steuerleitung vom DVB-C-Kanaldekoder zum ersten Tuner

14

AGC-Steuerleitung vom Zwischenfrequenz-IC zum ersten Tuner

15

AGC-Steuerleitung vom DVB-S-Kanaldekoder zum zweiten Tuner

16

Transportstrom-Datenbus

17

optionaler CI-Schacht

18

MPEG-Dekoder

19

digitales Videosignal (ITU656)

20

Soundprozessor

21

FBAS-Signal

22

Videoprozessor

23

zweites Zwischenfrequenzsignal (Audio)

24

NF-Signal(Audio)

Where:

1

wired transmission path

2

terrestrial transmission path

3

satellite-based transmission path

4

first tuner

5

second tuner

6

Intermediate frequency output of the first tuner

7

Intermediate frequency output of the second tuner

8th

DVB-T channel decoder

9

DVB-C channel decoder

10

DVB-S channel decoder

11

Intermediate frequency IC

12

AGC control line from DVB-T channel decoder to the first tuner

13

AGC control line from DVB-C channel decoder to first tuner

14

AGC control line from the intermediate frequency IC to the first tuner

15

AGC control line from DVB-S channel decoder to second tuner

16

Transport stream data

17

optional CI slot

18

MPEG decoder

19

digital video signal (ITU656)

20

sound processor

21

Composite video signal

22

video processor

23

second intermediate frequency signal (audio)

24

LF signal (audio)

A first tuner present in the radio receiving device ( 4 ) can alternatively be connected to the wired transmission path ( 1 ) or to the terrestrial transmission path ( 2 ) and accordingly receive the following terrestrial and wired signals:

• – analoges terrestrisches Fernsehen
• – analoger terrestrischer Hörrundfunk (UKW/FM)
• – digitales terrestrisches Fernsehen (DVB-T)
• – digitaler terrestrischer Hörrundfunk (gemäß DVB-T-Norm)

Terrestrial from the first tuner ( 4 ) signals to be received:

• - analog terrestrial television
• - analog terrestrial radio (FM / FM)
• - digital terrestrial television (DVB-T)
• - digital terrestrial radio broadcasting (according to DVB-T standard)

• – analoges Kabelfernsehen
• – digitales Kabelfernsehen (DVB-C)
• – analoger kabelgebundener Hörrundfunk (gemäß der Norm für analoges Kabelfernsehen)
• – digitaler kabelgebundener Hörrundfunk (gemäß der DVB-C-Norm)

Wired from the first tuner ( 4 ) signals to be received:

• - analog cable TV
• - digital cable TV (DVB-C)
• - analogue wired audio broadcasting (according to the standard for analogue cable television)
• - digital wired audio broadcasting (according to the DVB-C standard)

• – digitales Satellitenfernsehen (DVB-S)
• – digitaler Satellitenhörrundfunk (gemäß der DVB-S-Norm)

A second tuner present in the radio receiving device ( 5 ) receives the following satellite-based transmitted signals:

• - digital satellite television (DVB-S)
• - digital satellite broadcasting (in accordance with the DVB-S standard)

The first tuner ( 4 ) transforms its input signal into an intermediate frequency signal, which is then applied to an intermediate frequency output of the first tuner ( 6 ) is available. From there, this first intermediate frequency signal is parallel to both a DVB-T channel decoder ( 8th ) as well as a DVB-C channel decoder ( 9 ) as well as a so-called "intermediate frequency IC" ( 11 ). This intermediate frequency BC ( 11 ) is responsible for the conversion of analog video and audio signals.

The intermediate frequency signal of the second tuner ( 5 ) is sent via the intermediate frequency output of the second tuner ( 7 ) a DVB-S channel decoder ( 10 ).

A central processor recognizes the standard of the received signal based on the program selection from its database and accordingly activates either the DVB-T channel decoder ( 8th ), the DVB-C channel decoder ( 9 )

the intermediate frequency IC ( 11 ) or the DVB-S channel decoder ( 10 ).

The transport stream outputs of the three channel decoders ( 8th / 9 / 10 ) are written to a common transport stream data bus ( 16 ) via which they are connected via an optional CI slot ( 17 ) to the MPEG decoder ( 18 ) are connected. Thus, if a DVB signal is received, the corresponding channel decoder activated by the central microprocessor sends its transport stream over the common transport stream data bus ( 16 ) to the MPEG decoder ( 18 ). The other two channel decoders as well as the intermediate frequency BC ( 11 ) are disabled for this period.

If an analog signal is received, the three channel decoders ( 8th / 9 / 10 ) from the central microprocessor and the intermediate frequency IC ( 11 ) is active. The intermediate frequency signal which the intermediate frequency IC ( 11 receives from the first tuner, it converts imagewise into a CVBS signal ( 21 ) and converts it on the sound side into a so-called "second intermediate frequency signal (audio)" ( 23 ), which is controlled by a sound processor ( 20 ) is further processed according to the state of the art. The composite signal ( 21 ), also in accordance with the prior art, in a video processor ( 22 ) decoded, digitized and standardized (ITU656) with the digital video signal ( 19 ), which consists of the video signal output of the

MPEG decoder ( 18 ), brought together and then further processed according to the prior art.

The channel decoder and the intermediate frequency IC are connected via control lines ( 12 / 13 / 14 / 15 ) is able to control the AGC of the tuner connected to it in order to match the input sensitivity of the tuner connected to it to the transmission characteristics of the signal path connected to the tuner.

Claims (4)

Circuit arrangement for receiving broadcast signals, in which a first tuner for receiving analog signals and several after at least two different methods of channel coded digital signals is used, and wherein the tuner has one or more intermediate frequency outputs, to the multiple channel decoder (s) operating according to these various methods and an intermediate frequency IC are connected and wherein the transport stream outputs of multiple channel decoder to a common transport stream data bus are connected and where a central processor capable of doing so is, these multiple channel decoder and the intermediate frequency IC individually to activate and deactivate and wherein the circuitry comprises a second tuner having one or more intermediate frequency outputs, to which at least one further channel decoder is connected, wherein the transport stream output of this at least one other Channel decoder connected to the common transport stream data bus and where the central processor is capable of doing this activate and deactivate at least one additional channel decoder and wherein the common transport stream data bus is terminated to exactly one MPEG decoder. Circuit arrangement according to claim 1, wherein the channel decoder capable of doing this are the AGC's of each connected to them To control tuners. Circuit arrangement according to one of the An 1 to 2, wherein the intermediate frequency IC is capable of controlling the AGC of the tuner connected to it. Circuit arrangement according to one of claims 2 to 3, with only one activated channel decoder or the activated intermediate frequency IC capable of doing this is the AGC of each connected to it To control tuners.